Cita APA

National Association of Secondary School Principals (U.S.). (1981). Schools in the middle. The Association.

Citación estilo Chicago

National Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va.: The Association, 1981.

Cita MLA

National Association of Secondary School Principals (U.S.). Schools in the Middle. The Association, 1981.

Warning: These citations may not always be 100% accurate.